They've been doing that a lot lately. Since they started replacing the "It's All Here" HD commercial with local commercials, they've been forgetting to switch back to HD about 50% of the time. Not a good record. I've sent them email about it but they've never responded.
I only started watching the CBS shows because they were in HD. If the local station isn't going to "throw the switch", I'm going to watch something else.
Pete